Answer: 96.138 J
Explanation:
Use equation for potential gravitational energy : Ep=mGh
Ep1=mGh1
Ep2=mGh2
-------------
Ep1= 3.5*9.81*1.2
Ep1=41.202 J
Ep2=3.5*9.81*4
Ep2=137.34 J
Ep=Ep2-Ep1
Ep=137.34-41.202
Ep= 96.138 J
Answer:
P = 2.45 N
Q = 6.65 N
Explanation:
According to Newton's 2nd Law:
Unbalanced Force = ma
where,
m = mass = 7 kg
a = acceleration
In the first case when both forces P and Q act on left side:
Unbalanced Force = P + Q
a = 1.3 m/s²
Therefore,
P + Q = (7 kg)(1.3 m/s²)
P + Q = 9.1 N ------------------------- equation 1
Now, in second case when both forces have different directions:
Unbalanced Force = Greater Force - Smaller Force
Unbalanced Force = Q - P
a = 0.6 m/s²
Therefore,
Q - P = (7 kg)(0.6 m/s²)
Q - P = 4.2 N ------------------- equation 2
Adding equation 1 and equation 2, we get:
(Q + P) + (Q - P) = 9.1 N + 4.2 N
2 Q = 13.3 N
<u>Q = 6.65 N</u>
Using this value in equation 2, we get:
6.65 N - P = 4.2 N
<u>P = 2.45 N</u>
Answer:
Newton's second law is a quantitative description of the changes that a force can produce on the motion of a body.
Explanation:
have great day
Answer:
We show added energy to a system as +Q or -W
Explanation:
The first law of thermodynamics states that, in an isolated system, energy can neither be created nor be destroyed;
Energy is added to the internal energy of a system as either work energy or heat energy as follows;
ΔU = Q - W
Therefore, when energy is added as heat energy to a system, we show the energy as positive Q (+Q), when energy is added to the system in the form of work, we show the energy as minus W (-W).